Atmel AVR XMEGA AU series User Manual

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8331B–AVR–03/12
Atmel AVR XMEGA AU
• Bit 7:0 – CNT[7:0]: Endpoint Byte Counter
This byte contains the eight lsbs of the USB endpoint counter (CNT).
20.14.4 CNTH – Counter High
• Bit 6 – AZLP: Automatic Zero Length Packet
When this bit is set, the USB module will manage the ZLP handshake by hardware. This
applies to IN endpoints only. When this bit is zero, the ZLP handshake must be managed by
firmware.
• Bit 6:2 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 1:0 – CNT[9:8]: Endpoint Byte Counter
These bits contain the two msbs of the USB endpoint counter (CNT).
20.14.5 DATAPTRL – Data Pointer Low
The DATAPTRL and DATAPTRH registers represent the 16-bit value, DATAPTR, that contains
the SRAM address to the endpoint data buffer.
• Bit 7:0 – DATAPTR[7:0]: Endpoint Dta Pointer Low
This byte contains the eight lsbs of the endpoint data pointer (DATAPTR).
20.14.6 DATAPTRH – Data Pointer High
Bit 76543210
+0x02 CNT[7:0] CNTL
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value X X X X X X X X
Bit 76543210
+0x03 AZLP – – – – – CNT[9:8] CNTH
Read/WriteR/WRRRRRR/WR/W
Initial ValueXXXXXXXX
Bit 76543210
+0x04 DATAPTR[7:0] DATAPTRL
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial ValueXXXXXXXX
Bit 76543210
+0x05 DATAPTR[15:8] DATAPTRH
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial ValueXXXXXXXX

Atmel AVR XMEGA AU series Specifications

General

Brand	Atmel
Model	AVR XMEGA AU series
Category	Microcontrollers
Language	English